This Digital Laser Tachometer DT-2236C provides measuring range of 2.5 to 99,999 RPM (laser), 0.5 to 19,999 RPM (contact), surface speed of 0.05 to 1,999.9 m/min and 0.2 to 6,560 ft/min, auto ranging and detecting distance of 50 up to 500mm or 2 to 20" inch.It has the widest measuring range on the market, The DT-2236C has an advanced one chip microcomputer LSI-circuit and crystal time base meachanism and its accuracy of (0.05% +1 digit).